# ISO Today vs SPP Go

The clearest difference is rating: SPP Go at 4.8 against ISO Today's 4.2. SPP Go also leads on review sentiment (100% vs 74%). ISO Today's advantage is ratings volume (102 vs 4) and iOS requirement (13.0 vs 16.4). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SPP Go holds the better App Store score, 4.8 against 4.2. That said, the two scores are not equally well evidenced: ISO Today has 102 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 74% of ISO Today's written reviews are positive against 100% of SPP Go's.

ISO Today ships an update every 3 months, SPP Go every 5 months. The most recent releases landed on June 9, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | ISO Today | SPP Go |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (102 ratings)](https://appshunter.io/ios/app/iso-today/id596881268/reviews) | **[4.8 (4 ratings)](https://appshunter.io/ios/app/spp-go/id6468679132/reviews)** |
| Number of ratings | **102** | 4 |
| Positive reviews | 74.1% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 5 months |
| Monetization | Free | Free |
| Size | 11 MB | 47 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [California Independent System Operator Corporation](https://appshunter.io/developer/596881471) | [Southwest Power Pool](https://appshunter.io/developer/1710426439) |

## What reviewers say

### ISO Today

[App page](https://appshunter.io/ios/app/iso-today/id596881268)

Track California's power grid status, energy prices, and renewable production. Receive alerts for conservation needs and monitor supply adequacy up to seven days ahead. View detailed supply breakdowns and historical data.

**Highlights:** Monitor resource adequacy capacity, View grid status and demand, Renewables and supply graphs, Wholesale energy price map, Receive Flex Alerts, Track calendar events

**Features:** macOS Compatibility

**In-app purchases:** none


### SPP Go

[App page](https://appshunter.io/ios/app/spp-go/id6468679132)

Stay informed about regional electricity grid conditions. Receive instant alerts for advisories and alerts impacting your service territory. Access additional grid condition information online.

**Highlights:** Real-time push notifications, Advisories and alerts, Service territory specific information, Grid condition updates, Access to additional online resources

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is ISO Today free?

ISO Today is free to download, with no in-app purchases.

### Is SPP Go free?

SPP Go is free to download, with no in-app purchases.

### Which has better reviews, ISO Today or SPP Go?

SPP Go is rated higher. ISO Today averages 4.2 out of 5 from 102 ratings, while SPP Go averages 4.8 from 4 ratings.

### Do ISO Today or SPP Go have ads?

Neither ISO Today nor SPP Go shows ads.

### Which is updated more often, ISO Today or SPP Go?

ISO Today ships an update every 3 months, and SPP Go every 5 months. Most recently, ISO Today was updated on June 9, 2026 and SPP Go on September 8, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*